Detailed Information

Cited 0 time in webofscience Cited 0 time in scopus
Metadata Downloads

Combined organic and colloidal fouling in forward osmosis: Fouling reversibility and the role of applied pressure

Authors
Kim, YeowonElimelech, MenachemShon, Ho KyongHong, Seungkwan
Issue Date
15-6월-2014
Publisher
ELSEVIER SCIENCE BV
Keywords
Forward osmosis; Combined organic and colloidal fouling; Alginate fouling; Silica fouling; Fouling reversibility
Citation
JOURNAL OF MEMBRANE SCIENCE, v.460, pp.206 - 212
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF MEMBRANE SCIENCE
Volume
460
Start Page
206
End Page
212
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/98219
DOI
10.1016/j.memsci.2014.02.038
ISSN
0376-7388
Abstract
In this study, we systematically investigated the propensity and reversibility of combined organic-colloidal fouling in forward osmosis (FO) under various solution chemistries (pH and calcium ion concentrations) and applied hydraulic pressure on the feed side. Alginate, silica colloids, and their mixture (i.e., combined organic-colloidal) were used as model foulants. Our findings demonstrate that combined organic-colloidal foulants caused more rapid flux decline than the individual foulants due to the synergistic effect of alginate and silica colloids. As a result, much lower flux recovery was achieved by physical cleaning induced by increasing the cross-flow rate, in contrast to single foulants of which the fouling layer was easily removed under all solution conditions. Interestingly, less flux decline was observed at neutral pH for combined fouling, while acidic conditions were favorable for alginate fouling and basic solutions caused more silica fouling, thereby providing clear evidence for the combined fouling effect It was also found that calcium ions enhanced water flux decline and induced the formation of less reversible combined organic-colloidal fouling layers. Lastly, the role of applied hydraulic pressure on the feed side in FO was examined to elucidate the mechanism of fouling layer formation, fouling reversibility, and water flux recovery. Higher fouling propensity and lower fouling reversibility of combined organic colloidal fouling were observed in the presence of applied hydraulic pressure on the feed side. This observation suggests that the lower fouling propensity and greater fouling reversibility in FO compared to reverse osmosis (RO), are attributable to unpressurized operating conditions in FO. (C) 2014 Elsevier B.V. All rights reserved.
Files in This Item
There are no files associated with this item.
Appears in
Collections
College of Engineering > School of Civil, Environmental and Architectural Engineering > 1. Journal Articles

qrcode

Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.

Related Researcher

Researcher Hong, Seung kwan photo

Hong, Seung kwan
공과대학 (건축사회환경공학부)
Read more

Altmetrics

Total Views & Downloads

BROWSE